CA2077619A1 - Coupler for connecting two plastic pipes and process and mold for producing the coupler - Google Patents
Coupler for connecting two plastic pipes and process and mold for producing the couplerInfo
- Publication number
- CA2077619A1 CA2077619A1 CA002077619A CA2077619A CA2077619A1 CA 2077619 A1 CA2077619 A1 CA 2077619A1 CA 002077619 A CA002077619 A CA 002077619A CA 2077619 A CA2077619 A CA 2077619A CA 2077619 A1 CA2077619 A1 CA 2077619A1
- Authority
- CA
- Canada
- Prior art keywords
- coupler
- section
- internal diameter
- rib
- diameter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 229920003023 plastic Polymers 0.000 title claims description 18
- 239000004033 plastic Substances 0.000 title claims description 18
- 238000000034 method Methods 0.000 title claims description 12
- 239000004814 polyurethane Substances 0.000 claims abstract description 34
- 229920002635 polyurethane Polymers 0.000 claims abstract description 33
- 239000011152 fibreglass Substances 0.000 claims abstract description 23
- 238000007789 sealing Methods 0.000 claims abstract description 21
- 239000011324 bead Substances 0.000 claims abstract description 8
- 238000004519 manufacturing process Methods 0.000 claims description 13
- 239000011248 coating agent Substances 0.000 claims description 12
- 238000000576 coating method Methods 0.000 claims description 12
- 238000005266 casting Methods 0.000 claims description 8
- 230000003247 decreasing effect Effects 0.000 claims description 8
- 238000007493 shaping process Methods 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 5
- 239000011521 glass Substances 0.000 claims description 4
- 239000000853 adhesive Substances 0.000 abstract description 3
- 230000001070 adhesive effect Effects 0.000 abstract description 3
- 239000010410 layer Substances 0.000 description 27
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 229920001296 polysiloxane Polymers 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 239000012790 adhesive layer Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L19/00—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L21/00—Joints with sleeve or socket
- F16L21/02—Joints with sleeve or socket with elastic sealing rings between pipe and sleeve or between pipe and socket, e.g. with rolling or other prefabricated profiled rings
- F16L21/022—Joints with sleeve or socket with elastic sealing rings between pipe and sleeve or between pipe and socket, e.g. with rolling or other prefabricated profiled rings used with sleeves or nipples for pipes of the same diameter, or with reduction pieces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
- B29C70/74—Moulding material on a relatively small portion of the preformed part, e.g. outsert moulding
- B29C70/76—Moulding on edges or extremities of the preformed part
- B29C70/766—Moulding on edges or extremities of the preformed part on the end part of a tubular article
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S285/00—Pipe joints or couplings
- Y10S285/915—Mastic
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
- Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
- Joints With Sleeves (AREA)
- Medicines Containing Material From Animals Or Micro-Organisms (AREA)
- Medicines Containing Plant Substances (AREA)
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
- Laminated Bodies (AREA)
- Moulding By Coating Moulds (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
The coupler consists of an essentially cylindrical outer layer of glass fiber-reinforced plastic and an inner layer consisting of polyurethane. This inner layer has, approximately in the middle between the two coupler ends, a rib which serves as a stop for the ends of the two pipes to be connected to one another. The coupler has, between this rib and one coupler end (a), an approximately conical inner shape which has a diameter which increases in an outward direction, this conical surface also being provided with two sealing beads. A cylindrical section, a sawtooth-like rib and an annular groove are present between the other coupler end and the rib. A coupler of this type can be mounted relatively simply on the end of a pipe and can be nondetachably connected to it also by means of an adhesive. A pipe of essentially the same diameter can be inserted into the other coupler end and gives a tight fit in the coupler even when the axes of the coupler and the pipe do not coincide but make a small angle with one another.
The coupler consists of an essentially cylindrical outer layer of glass fiber-reinforced plastic and an inner layer consisting of polyurethane. This inner layer has, approximately in the middle between the two coupler ends, a rib which serves as a stop for the ends of the two pipes to be connected to one another. The coupler has, between this rib and one coupler end (a), an approximately conical inner shape which has a diameter which increases in an outward direction, this conical surface also being provided with two sealing beads. A cylindrical section, a sawtooth-like rib and an annular groove are present between the other coupler end and the rib. A coupler of this type can be mounted relatively simply on the end of a pipe and can be nondetachably connected to it also by means of an adhesive. A pipe of essentially the same diameter can be inserted into the other coupler end and gives a tight fit in the coupler even when the axes of the coupler and the pipe do not coincide but make a small angle with one another.
Description
2~7~6~
Coupler for connecting two plastic pipes and process and mold for ~roducin~ the coupler BACKGROUND OF THE INVENT]:ON
Couplers are used for connecting two pipes. The couplers used are either cylindrical pipe sections into which one end of each pipe can be screwed or pushed and fastened in some manner from each side. However, it is also possible, during production, to provide one end of a pipe with an extension which serves as a coupler and into which the unextended end of an identical pipe can then be pushed. These two methods are also known in the case of plastic pipes. The advantages and the disadvantages of these types of couplers are also known.
To ensure a tight connection between the pipe and the sleeve, either the pipe or the coupler can be provided with sealing means. It is known that a qroove can be provided close to the pipe end, in which groove a sealing means, such as, for example, an O-ring or something similar, is housed. Since this reduces the wall thickness of the pipe, which is undesirable particularly in pipes which are laid in the ground and are governed by the pressing method, and therefore should be avoided, couplers which consist of a resilient inner part provided with lips and a covering of solid material applied on said inner part are also known. Couplers of this type are very complicated to produce and are therefore expensive.
.
SUMMARY OF THE INVENTION
It is an object of the invention to prov:lde a co-lpLer which has none of these above-mentioned disadvantages since it is formed in such a way that, owing to its 2 2~7~ 9 internal sealin~ me~ns, it can be pushed tightly onto a pip~ end which is free of sealing means and, if desired, can be fastened to it, so that a further pipe can be inserted therein detachably but with a tight seal.
This objec-t is achieved according to the invention by a coupler which is particularly suitab:le for connecting two seal-free, glass fiber-reinforced plastic pipes, wherein the coupler has an essentially cylindrical outer layer of glass fiber-reinforced plastic and, at least in the region of one edge, an inner layer which consists of integrally molded polyurethane and has an internal diameter decreasing toward the interior of the coupler, said diameter in a section between two edges being at least as large as at the edge with the larger internal diameter.
Various embodiments are possible, namely those which serve for connecting two pipes which have a cylindrical end section with a diameter smaller than that of the remaining pipe section and thus permit the production of a pipeline having a constant external diameter, i.e.
a pipeline with no external beads or ribs, and also embodiments which can be mounted on shoulder-free pipes, i.e. pipes which have the same external diameter over the entire length.
It is furthermore an object of the invention to provide a process for the production of a coupler provided with sealing means and intended for connecting two plastic pipes free of sealing means, wherein the coupler has an essentially cylindrical outer layer of glass fiber-reinforced plastic and, at least in the region of one edge, an inner layer consisting of integrally molded polyurethane and having an internal diameter decreasing toward the interior of the coupler, wherein, in a section between the two edges, the internal diame~er of 3 2 ~ 7~ fi~ 3 the coupler is at least as large as at the edge with the larger internal diameter, and wherein a hollow cylinder of glass fiber-reinforced plastic ls provided, by casting the molding, with an inner coating of polyurethane in such a manner that this coating gives the above-mentioned internal shape.
It is also an object of the invention to provide a snold for carrying out the process for the production of a coupler provided with a sealinq means and intended for connecting two plastic pipes which are free of sealing : means and are each provided with a cylindrical end section having a diameter D~ which is smaller than the external diameter D1 of the remaining pipe section, wherein the coupler has an essentially cylindrical outer layer of glass fiber-reinforced plastic and, at least in the region of one edge, an inner layer consisting of integrally molded polyurethane and having an internal diameter decreasing toward the interior of the coupler, wherein, in a section between the two edges, the in~ernal diameter of the coupler is at least as large as at the edge with the larger internal diameter, wherein the coupler is twice as long as the cylindrical end section, wherein the external diameter of the coupler essentially corresponds to the external diameter Dl of the remaining pipe section, wherein only one polyurethane layer beginning at one edge and extending only over up to 30 - 50~ of the coupler length is present in the interior of the coupler, wherein a hollow cylinder of glass fiber-reinforced plastic is provided, by casting the mold, with an inner coating of polyurethane in such a manner that this coating gives the above-mentioned inner shape, wherein the mold consists of a baseplate and a mold 4 2~7~6~ ~
ring which can be, or is, connected to it, in order to impart the inner shape to th~ polyurethane inner layer to be produced by casting, and wherein the baseplate has positloning means in order to position the hollow cylinder of glass fiber-reinforced plastic coaxially with the mold ring.
It is moreover an object of the invent:ion to provide a mold for carrying out the process for the production of a coupler provided with sealing means and intended for connecting two shoulder-free plastic pipes free of sealing means, wherein the coupler has an essentially cylindrical outer layer of glass fiber-reinforced plastic and, at least in the region of one edge, an inner layer consisting of integrally molded polyurethane and having an internal diameter decreasing toward the interior of the coupler, wherein, in a section between the two edges, the internal diameter of the coupler is at least as large as at the edge with the larger internal diameter, wherein the inner layer has, approximately in the middle between the two coupler ends, a rib which serves as the stop for the pipes to be connected to one another, wherein the inner surface of the coupler widens conically from this rib to one coupler end and is provided with at least one sealing bead running all around, while a cylindrical section, a rib projecting in a saw-tooth manner into the interior of the coupler and,adjacent to the radial flank of said rib, an annular groove are present between the other coupler end and the rib, the groove diameter n being larger than the internal diameter D4 of the cylindrical section, the latter essentially corresponding to the diameter D5 at the opposite coupler end, wherein a hollow cylinder of glass fiber-reinforced plastic is provided, by casting in a mold, with an inner coating of polyurethane in such a manner that this coating gives the abov~-mentioned internal shape, and wherein the mold has three individual parts, n~mely a first metallic part having a sleeve which serves for shaping the conical section and a lateral surface and the end surface of the rib and which is connected to an end plate extending radially outward and having a retaining ring which serves for holding the cylindrical, glass fiber-reinforced ring, a second cylindrical metal sleeve which serves for shaping the cylindrical section and a saw-tooth flank and can be pushed onto the first metal ring and a plastic ring which can be taken apart and serves for forming the annular groove.
BRIEF DESCRIPTION OF THE DRAWINGS
Embodiments of the invention are described below with reference to the attached drawings. In the drawings, Figure 1 shows a longitudinal section through a coupler according to the invention and through the two ends of the pip~s to be : connected to one another, and Figure 2 shows a vertical section through a mold for : the production of this coupler according to the invention;
Figure 3 shows a longitudinal section through another embodiment of a coupler according to the invention and through the two ends of the pipes to be connected to one another, and Figure 4 shows a part of a longitudinal section through a mold for the production of the coupler shown in Flgure 3.
6 2~77~
DESCRIPTION OF THE PREFER~ED EMBODIMENTS
The coupler shown in ~igure 1 and designated as a whole by 1 and intended for connecting the two glass fiber-reinforced plastic pipes 2 and 3 has the same external diameter Dl as both pipes 2 and 3. To permit it to be pushed onto the pipes, the latter are provided with cylindrical pipe end section 4 whose diameter D2 is ; smaller than the diameter Dl of the main pipe section.
The coupler 1 itself consists of a cylindrical outer layer 5 of glass fiber-reinforced plastic and an inner layer 7 which consists of integrally molded polyurethane but does not extend over the entire inner surface but only over a region beginning at the edge and extending over 30 - 50% of the coupler length, while the remaining inner surface 6 of the coupler 1 is polyurethane-free. The polyurethane layer 7 has, at the coupler edge, an internal diameter D3 which corresponds to the external diameter D2 of the cylindrical pipe end section 4 or is at most 0.5%
~0 greater than said external diameter. This diameter becomes smaller with increasing distance from the coupler edge and the contour of the inner surface may correspond to the view in the drawing but may also be different, for example rounded. It is essential that the inner diameter of the polyurethane layer decreases toward the interior of the coupler. In the embodiment shown, the polyurethane-free section 6 is bordered by an essentially radial surface 8 whichr however, could also have a shape differing slightly therefrom. The length b of the coupler corresponds approximately to twice the length a of the cylindrical end section.
This design ensures that a pipe section composed of such pipes and couplers has a uniform surface on the outside, so that such a pipe can be laid by the pressing process. If the coupler length b is slightly smaller than twice the lengt~l a of the cylindrical section, the individual pipes can abut one ano-ther directly, which is advantageous for transmission of the forces during driving. During use, the coupler 1 shown is pushed onto the plastic pipe 2 to the left of it and is firmly connected -to the pipe by means of an adhesiv 9 applied before the coupler is pushed on. The thickness of this adhesive layer must correspond to at least hal~ the difference between the internal diameter of the coupler 1 and the external diam~ter D2 of the pipe end section 4. The pipe on the right is then inserted. ~t is quite possible to use pipes in which the end sections 4 have different diameters at the two end sections, namely a larger one on which the coupler is fastened by means of the adhesive and a smaller one which is inserted into the coupler and if necessary can also be withdrawn from it. As can be seen, it is also possible in this design to lay the pipes 2 and 3 not only coaxially with one another but also in such a way that their axes make a small angle with one another, the necessary tightness of the connection being ensured in all positions by the polyurethane layer.
As described below with reference to Figure ~, such a coupler can be produced in a very simple manner. The mold used for production consists of a baseplate 10 and a mold ring 11 which is, or can be, connected to said baseplate, the baseplate 10 having positioning means 12 in order to mount the glass fiber-reinforced hollow plastic cylinder 5 coaxially with the mold ring 11 on the plate. These positioning means may be a ring or projections formed in another manner, for example pins, which are firmly or detachably connected to the baseplate 10. After the hollow cylinder h~s been mounted, the gap between it and the mold ring ll is filled with polyure-thane, with the result that the inner layer 7, which is firmly connected to the ring, 8 2~7~
is formed. ~or this purpose, it is of course necessary to treat the sur~aces of the plastic ring in a manner known per se~ so -that a permanent connection bet~een the inner layer 7 and the outer layer 5 is ensured.
After solidification of this inner layer, the hollow cylinder 5 can be rotated and can be provided at its other end too with a polyurethane layer if the coupler is not to be connected nondetachably to a pipe end.
A second embodiment of -the invention is shown in Figure 3 of the drawing. The coupler designated here as a whole by 21 also has an essentially cylindrical outer layer 22 of glass fiber-reinforced plastic and an inner ~ layer designated by 23 and consisting of polyurethane.
; This inner layer possesses, approximately in the middle between the two coupler ends 21a and 21b, a rib 26 which serves as a stop for the two pipes 24 and 25 to be connected to one another. The inner surface 27 of the coupler widens conically between this rib 26 and ` one coupler end 21a, ~he left one in the drawing. In the embodiment, this conical surface is provided with two rather flat sealing beads 28 and Z9 running all around. The conical inner surface 27 makes an angle of about 4 with the axis 30. If the internal diameter D5 on the side a of the coupler 21 is a little larger than the external diameter D6 of the pipe 24, the coupler can be readily pushed onto the pipe end. The bevel 31 at the pipe end, shown in the drawing, also makes it quite possible for the coupler to be pushed onto the pipe end without great difficulty in spite of the beads 28 and 29, until the rib 26 is at the pipe end. During this pushing-on procedure, the interior of the coupler does of course become slightly deformed and the polyurethane layer 23 is compressed, partlcul~rly in the region of the beads 28 and 29. If the exterior oi the pipe or the interior of the coupler is provided with an adhesive, the coupler 21 can be connected 2 ~
permanently and nonde~achably -to the pipe 24 in such a way that the coupler axis 30 coincides with the pipe axis 32.
The region in -the pipe interior between the rib 26 and the coupler end 21b on the right in the drawing is now somewhat different: at the very outside is a cylindrica.l section 33, which in this case can also be provided at its outer end with a bevel 34. This cylindrical section 33 is followed by a rib 35 which projec-ts in a sawtooth-like manner into the interior of the coupler, while an annular groove 36 is formed between this rib 35 and the rib 26. As can be seen from the drawing, the internal diameter n of the groove 36 is slightly larger than the internal diameter D4 of the cylindrical section 33. The latter diameter essentially corresponds to the internal diameter D5 at the opposite coupler end a, and it may be insignificantly smaller than the diameter D5 at the free end of the conical section 27, particularly when the cylindrical part 33 is provided with a bevel 34.
This coupler end b too is intended for insertion of a pipe 25 having the external diameter D6, the dimensions pre~erably being chosen so that D6 ~ D4 ' 1.005 D6 i.e. the internal diameter D4 of the cylindrical section 33 is equal to or up to 0.5% greater than the external diameter D6 of the pipe 25, while the diameter n of the groove 36 is 2% to 5% greater than the external diameter D6 of this pipe. In contrast, however, the internal diameter s of the sawtooth rib 35 is 5% to 10% smaller than the external diameter D6 f the pipe 25. Thus, 98.5 99.65 D6 < S < D6.
These dimensions on the right side o~ the coupler make 2 ~
it easy to insert the pipe 25 into the coupler, ensure a tight seal by the sawtooth-like rib 35, which is deformed, i.e. compressed and slightly curved, on insertion of the pipe 25, and, by means of the groove S 36, make it possible ~or the axis 30 of the coupler 21 to make a small angle of up to 5 with the axis 37 of the pipe 25.
On insertion of a very large and correspondingly heavy pipe, i.e. a pipe having a diame-ter of 1 m or more, a gap of uniform size will not be formed between the cylindrical inner surface 33 of the coupler and the outer surface of the pipe 25 but instead the pipe will rest on the bottom of the cylindrical surface 33 and, depending on the dimensions, a gap of up to 0.5% of the pipe diameter will form between the pipe 25 and the upper part of the cylindrical surface. However, a tight connection of the pipe 25 in the coupler 21 is still ensured because in fact the internal diameter of the sawtooth rib 35 is at least 0.35~ smaller than the diameter D6 of the pipe 5.
.; , The coupler 21 described above is produced using a mold as shown in Figure 4 and designated as a whole by 40.
It consists of three individual parts, namely - a first metallic part 41 having a sleeve 42, an end plate 43 and a retaining ring 44, - a second metal sleeve 45 and - a plastic ring 46 which can be divided up into individual segments.
The sleeve 42 has, on the outside, a section 42a for shaping the conical section 27 of the coupler, thereafter a section 42b for shaping one lateral surface of ~he rib 26 and a section 42c for shaping the end surface of this rib 26. The end plate 43 which is provided on its outer end with a retaining ring 44 7 ~
which serves to hold a prefabricated, glass fi~er-reinforced ring or hollow cylinder 21 coaxially with the sleeve 42 is integrally molded on that end of the s].eeve 42 which faces away from the cylindrical surface 42c.
The metallic sleeve 45 has three different sections on its outer surface: at the very outside a cylindrical section 45a for forming the cylindrical surface 33, then a conical section 45b for forming the flank of the sawtooth 35 and thereafter a section of small diameter for receiving the plastic ring 46, which may consist of, for example, silicone and is divided up in such a way that it can be removed from the coupler 21 after the production of the inner layer 23 of the coupler 21, which layer consists of polyurethane. To ensure that the two parts 41 and 45 can be joined coaxially, the end surface of the sleeve 42 has an indentation 41d whose diameter corresponds to the diameter of the adjacent end surface of the sleeve 45.
The above description of the moId also indicates its use, i.e. a process for production of the sleeve 21 according to the invention: a cylinder 22 of glass fiber-reinforced plastic is taken and is placed in the mold 40, the space bordered by the hollow cylinder 22, the sleeve 42, the ring 46 and the sleeve 45 is filled with liquid polyurethane and, after solidification, first the mold part 41, then the sleeve 45 and finally the silicone ring 46 are removed; as is known by those skilled in the art, the inner surface of the glass fiber-reinforced plastic ring is formed in such a way that the polyurethane bonds firmly -to it while the mold parts are treated so that the solid polyurethane can be readily detached from them.
Coupler for connecting two plastic pipes and process and mold for ~roducin~ the coupler BACKGROUND OF THE INVENT]:ON
Couplers are used for connecting two pipes. The couplers used are either cylindrical pipe sections into which one end of each pipe can be screwed or pushed and fastened in some manner from each side. However, it is also possible, during production, to provide one end of a pipe with an extension which serves as a coupler and into which the unextended end of an identical pipe can then be pushed. These two methods are also known in the case of plastic pipes. The advantages and the disadvantages of these types of couplers are also known.
To ensure a tight connection between the pipe and the sleeve, either the pipe or the coupler can be provided with sealing means. It is known that a qroove can be provided close to the pipe end, in which groove a sealing means, such as, for example, an O-ring or something similar, is housed. Since this reduces the wall thickness of the pipe, which is undesirable particularly in pipes which are laid in the ground and are governed by the pressing method, and therefore should be avoided, couplers which consist of a resilient inner part provided with lips and a covering of solid material applied on said inner part are also known. Couplers of this type are very complicated to produce and are therefore expensive.
.
SUMMARY OF THE INVENTION
It is an object of the invention to prov:lde a co-lpLer which has none of these above-mentioned disadvantages since it is formed in such a way that, owing to its 2 2~7~ 9 internal sealin~ me~ns, it can be pushed tightly onto a pip~ end which is free of sealing means and, if desired, can be fastened to it, so that a further pipe can be inserted therein detachably but with a tight seal.
This objec-t is achieved according to the invention by a coupler which is particularly suitab:le for connecting two seal-free, glass fiber-reinforced plastic pipes, wherein the coupler has an essentially cylindrical outer layer of glass fiber-reinforced plastic and, at least in the region of one edge, an inner layer which consists of integrally molded polyurethane and has an internal diameter decreasing toward the interior of the coupler, said diameter in a section between two edges being at least as large as at the edge with the larger internal diameter.
Various embodiments are possible, namely those which serve for connecting two pipes which have a cylindrical end section with a diameter smaller than that of the remaining pipe section and thus permit the production of a pipeline having a constant external diameter, i.e.
a pipeline with no external beads or ribs, and also embodiments which can be mounted on shoulder-free pipes, i.e. pipes which have the same external diameter over the entire length.
It is furthermore an object of the invention to provide a process for the production of a coupler provided with sealing means and intended for connecting two plastic pipes free of sealing means, wherein the coupler has an essentially cylindrical outer layer of glass fiber-reinforced plastic and, at least in the region of one edge, an inner layer consisting of integrally molded polyurethane and having an internal diameter decreasing toward the interior of the coupler, wherein, in a section between the two edges, the internal diame~er of 3 2 ~ 7~ fi~ 3 the coupler is at least as large as at the edge with the larger internal diameter, and wherein a hollow cylinder of glass fiber-reinforced plastic ls provided, by casting the molding, with an inner coating of polyurethane in such a manner that this coating gives the above-mentioned internal shape.
It is also an object of the invention to provide a snold for carrying out the process for the production of a coupler provided with a sealinq means and intended for connecting two plastic pipes which are free of sealing : means and are each provided with a cylindrical end section having a diameter D~ which is smaller than the external diameter D1 of the remaining pipe section, wherein the coupler has an essentially cylindrical outer layer of glass fiber-reinforced plastic and, at least in the region of one edge, an inner layer consisting of integrally molded polyurethane and having an internal diameter decreasing toward the interior of the coupler, wherein, in a section between the two edges, the in~ernal diameter of the coupler is at least as large as at the edge with the larger internal diameter, wherein the coupler is twice as long as the cylindrical end section, wherein the external diameter of the coupler essentially corresponds to the external diameter Dl of the remaining pipe section, wherein only one polyurethane layer beginning at one edge and extending only over up to 30 - 50~ of the coupler length is present in the interior of the coupler, wherein a hollow cylinder of glass fiber-reinforced plastic is provided, by casting the mold, with an inner coating of polyurethane in such a manner that this coating gives the above-mentioned inner shape, wherein the mold consists of a baseplate and a mold 4 2~7~6~ ~
ring which can be, or is, connected to it, in order to impart the inner shape to th~ polyurethane inner layer to be produced by casting, and wherein the baseplate has positloning means in order to position the hollow cylinder of glass fiber-reinforced plastic coaxially with the mold ring.
It is moreover an object of the invent:ion to provide a mold for carrying out the process for the production of a coupler provided with sealing means and intended for connecting two shoulder-free plastic pipes free of sealing means, wherein the coupler has an essentially cylindrical outer layer of glass fiber-reinforced plastic and, at least in the region of one edge, an inner layer consisting of integrally molded polyurethane and having an internal diameter decreasing toward the interior of the coupler, wherein, in a section between the two edges, the internal diameter of the coupler is at least as large as at the edge with the larger internal diameter, wherein the inner layer has, approximately in the middle between the two coupler ends, a rib which serves as the stop for the pipes to be connected to one another, wherein the inner surface of the coupler widens conically from this rib to one coupler end and is provided with at least one sealing bead running all around, while a cylindrical section, a rib projecting in a saw-tooth manner into the interior of the coupler and,adjacent to the radial flank of said rib, an annular groove are present between the other coupler end and the rib, the groove diameter n being larger than the internal diameter D4 of the cylindrical section, the latter essentially corresponding to the diameter D5 at the opposite coupler end, wherein a hollow cylinder of glass fiber-reinforced plastic is provided, by casting in a mold, with an inner coating of polyurethane in such a manner that this coating gives the abov~-mentioned internal shape, and wherein the mold has three individual parts, n~mely a first metallic part having a sleeve which serves for shaping the conical section and a lateral surface and the end surface of the rib and which is connected to an end plate extending radially outward and having a retaining ring which serves for holding the cylindrical, glass fiber-reinforced ring, a second cylindrical metal sleeve which serves for shaping the cylindrical section and a saw-tooth flank and can be pushed onto the first metal ring and a plastic ring which can be taken apart and serves for forming the annular groove.
BRIEF DESCRIPTION OF THE DRAWINGS
Embodiments of the invention are described below with reference to the attached drawings. In the drawings, Figure 1 shows a longitudinal section through a coupler according to the invention and through the two ends of the pip~s to be : connected to one another, and Figure 2 shows a vertical section through a mold for : the production of this coupler according to the invention;
Figure 3 shows a longitudinal section through another embodiment of a coupler according to the invention and through the two ends of the pipes to be connected to one another, and Figure 4 shows a part of a longitudinal section through a mold for the production of the coupler shown in Flgure 3.
6 2~77~
DESCRIPTION OF THE PREFER~ED EMBODIMENTS
The coupler shown in ~igure 1 and designated as a whole by 1 and intended for connecting the two glass fiber-reinforced plastic pipes 2 and 3 has the same external diameter Dl as both pipes 2 and 3. To permit it to be pushed onto the pipes, the latter are provided with cylindrical pipe end section 4 whose diameter D2 is ; smaller than the diameter Dl of the main pipe section.
The coupler 1 itself consists of a cylindrical outer layer 5 of glass fiber-reinforced plastic and an inner layer 7 which consists of integrally molded polyurethane but does not extend over the entire inner surface but only over a region beginning at the edge and extending over 30 - 50% of the coupler length, while the remaining inner surface 6 of the coupler 1 is polyurethane-free. The polyurethane layer 7 has, at the coupler edge, an internal diameter D3 which corresponds to the external diameter D2 of the cylindrical pipe end section 4 or is at most 0.5%
~0 greater than said external diameter. This diameter becomes smaller with increasing distance from the coupler edge and the contour of the inner surface may correspond to the view in the drawing but may also be different, for example rounded. It is essential that the inner diameter of the polyurethane layer decreases toward the interior of the coupler. In the embodiment shown, the polyurethane-free section 6 is bordered by an essentially radial surface 8 whichr however, could also have a shape differing slightly therefrom. The length b of the coupler corresponds approximately to twice the length a of the cylindrical end section.
This design ensures that a pipe section composed of such pipes and couplers has a uniform surface on the outside, so that such a pipe can be laid by the pressing process. If the coupler length b is slightly smaller than twice the lengt~l a of the cylindrical section, the individual pipes can abut one ano-ther directly, which is advantageous for transmission of the forces during driving. During use, the coupler 1 shown is pushed onto the plastic pipe 2 to the left of it and is firmly connected -to the pipe by means of an adhesiv 9 applied before the coupler is pushed on. The thickness of this adhesive layer must correspond to at least hal~ the difference between the internal diameter of the coupler 1 and the external diam~ter D2 of the pipe end section 4. The pipe on the right is then inserted. ~t is quite possible to use pipes in which the end sections 4 have different diameters at the two end sections, namely a larger one on which the coupler is fastened by means of the adhesive and a smaller one which is inserted into the coupler and if necessary can also be withdrawn from it. As can be seen, it is also possible in this design to lay the pipes 2 and 3 not only coaxially with one another but also in such a way that their axes make a small angle with one another, the necessary tightness of the connection being ensured in all positions by the polyurethane layer.
As described below with reference to Figure ~, such a coupler can be produced in a very simple manner. The mold used for production consists of a baseplate 10 and a mold ring 11 which is, or can be, connected to said baseplate, the baseplate 10 having positioning means 12 in order to mount the glass fiber-reinforced hollow plastic cylinder 5 coaxially with the mold ring 11 on the plate. These positioning means may be a ring or projections formed in another manner, for example pins, which are firmly or detachably connected to the baseplate 10. After the hollow cylinder h~s been mounted, the gap between it and the mold ring ll is filled with polyure-thane, with the result that the inner layer 7, which is firmly connected to the ring, 8 2~7~
is formed. ~or this purpose, it is of course necessary to treat the sur~aces of the plastic ring in a manner known per se~ so -that a permanent connection bet~een the inner layer 7 and the outer layer 5 is ensured.
After solidification of this inner layer, the hollow cylinder 5 can be rotated and can be provided at its other end too with a polyurethane layer if the coupler is not to be connected nondetachably to a pipe end.
A second embodiment of -the invention is shown in Figure 3 of the drawing. The coupler designated here as a whole by 21 also has an essentially cylindrical outer layer 22 of glass fiber-reinforced plastic and an inner ~ layer designated by 23 and consisting of polyurethane.
; This inner layer possesses, approximately in the middle between the two coupler ends 21a and 21b, a rib 26 which serves as a stop for the two pipes 24 and 25 to be connected to one another. The inner surface 27 of the coupler widens conically between this rib 26 and ` one coupler end 21a, ~he left one in the drawing. In the embodiment, this conical surface is provided with two rather flat sealing beads 28 and Z9 running all around. The conical inner surface 27 makes an angle of about 4 with the axis 30. If the internal diameter D5 on the side a of the coupler 21 is a little larger than the external diameter D6 of the pipe 24, the coupler can be readily pushed onto the pipe end. The bevel 31 at the pipe end, shown in the drawing, also makes it quite possible for the coupler to be pushed onto the pipe end without great difficulty in spite of the beads 28 and 29, until the rib 26 is at the pipe end. During this pushing-on procedure, the interior of the coupler does of course become slightly deformed and the polyurethane layer 23 is compressed, partlcul~rly in the region of the beads 28 and 29. If the exterior oi the pipe or the interior of the coupler is provided with an adhesive, the coupler 21 can be connected 2 ~
permanently and nonde~achably -to the pipe 24 in such a way that the coupler axis 30 coincides with the pipe axis 32.
The region in -the pipe interior between the rib 26 and the coupler end 21b on the right in the drawing is now somewhat different: at the very outside is a cylindrica.l section 33, which in this case can also be provided at its outer end with a bevel 34. This cylindrical section 33 is followed by a rib 35 which projec-ts in a sawtooth-like manner into the interior of the coupler, while an annular groove 36 is formed between this rib 35 and the rib 26. As can be seen from the drawing, the internal diameter n of the groove 36 is slightly larger than the internal diameter D4 of the cylindrical section 33. The latter diameter essentially corresponds to the internal diameter D5 at the opposite coupler end a, and it may be insignificantly smaller than the diameter D5 at the free end of the conical section 27, particularly when the cylindrical part 33 is provided with a bevel 34.
This coupler end b too is intended for insertion of a pipe 25 having the external diameter D6, the dimensions pre~erably being chosen so that D6 ~ D4 ' 1.005 D6 i.e. the internal diameter D4 of the cylindrical section 33 is equal to or up to 0.5% greater than the external diameter D6 of the pipe 25, while the diameter n of the groove 36 is 2% to 5% greater than the external diameter D6 of this pipe. In contrast, however, the internal diameter s of the sawtooth rib 35 is 5% to 10% smaller than the external diameter D6 f the pipe 25. Thus, 98.5 99.65 D6 < S < D6.
These dimensions on the right side o~ the coupler make 2 ~
it easy to insert the pipe 25 into the coupler, ensure a tight seal by the sawtooth-like rib 35, which is deformed, i.e. compressed and slightly curved, on insertion of the pipe 25, and, by means of the groove S 36, make it possible ~or the axis 30 of the coupler 21 to make a small angle of up to 5 with the axis 37 of the pipe 25.
On insertion of a very large and correspondingly heavy pipe, i.e. a pipe having a diame-ter of 1 m or more, a gap of uniform size will not be formed between the cylindrical inner surface 33 of the coupler and the outer surface of the pipe 25 but instead the pipe will rest on the bottom of the cylindrical surface 33 and, depending on the dimensions, a gap of up to 0.5% of the pipe diameter will form between the pipe 25 and the upper part of the cylindrical surface. However, a tight connection of the pipe 25 in the coupler 21 is still ensured because in fact the internal diameter of the sawtooth rib 35 is at least 0.35~ smaller than the diameter D6 of the pipe 5.
.; , The coupler 21 described above is produced using a mold as shown in Figure 4 and designated as a whole by 40.
It consists of three individual parts, namely - a first metallic part 41 having a sleeve 42, an end plate 43 and a retaining ring 44, - a second metal sleeve 45 and - a plastic ring 46 which can be divided up into individual segments.
The sleeve 42 has, on the outside, a section 42a for shaping the conical section 27 of the coupler, thereafter a section 42b for shaping one lateral surface of ~he rib 26 and a section 42c for shaping the end surface of this rib 26. The end plate 43 which is provided on its outer end with a retaining ring 44 7 ~
which serves to hold a prefabricated, glass fi~er-reinforced ring or hollow cylinder 21 coaxially with the sleeve 42 is integrally molded on that end of the s].eeve 42 which faces away from the cylindrical surface 42c.
The metallic sleeve 45 has three different sections on its outer surface: at the very outside a cylindrical section 45a for forming the cylindrical surface 33, then a conical section 45b for forming the flank of the sawtooth 35 and thereafter a section of small diameter for receiving the plastic ring 46, which may consist of, for example, silicone and is divided up in such a way that it can be removed from the coupler 21 after the production of the inner layer 23 of the coupler 21, which layer consists of polyurethane. To ensure that the two parts 41 and 45 can be joined coaxially, the end surface of the sleeve 42 has an indentation 41d whose diameter corresponds to the diameter of the adjacent end surface of the sleeve 45.
The above description of the moId also indicates its use, i.e. a process for production of the sleeve 21 according to the invention: a cylinder 22 of glass fiber-reinforced plastic is taken and is placed in the mold 40, the space bordered by the hollow cylinder 22, the sleeve 42, the ring 46 and the sleeve 45 is filled with liquid polyurethane and, after solidification, first the mold part 41, then the sleeve 45 and finally the silicone ring 46 are removed; as is known by those skilled in the art, the inner surface of the glass fiber-reinforced plastic ring is formed in such a way that the polyurethane bonds firmly -to it while the mold parts are treated so that the solid polyurethane can be readily detached from them.
Claims (8)
1. A coupler provided with sealing means and intended for connecting two plastic pipes free of sealing means, wherein said coupler has an essentially cylindrical outer layer of glass fiber-reinforced plastic and, at least in the region of one edge, an inner layer consisting of integrally molded polyurethane and having an internal diameter decreasing toward the interior of the coupler, and, in a section between the two edges, the internal diameter of the coupler is at least as large as at the edge with the larger internal diameter.
2. A coupler as claimed in claim 1 for connecting two plastic pipes, each of which is provided with a cylindrical pipe end section having a diameter D2 which is smaller than the external diameter D1 of the remaining pipe section, wherein said coupler is about twice as long as the cylindrical end section, wherein its external diameter essentially corresponds to the external diameter D1 of the remaining pipe section and wherein only one polyurethane layer beginning at one edge and extending only over up to 30 - 50% of the coupler length is present in the interior of the coupler.
3. A coupler as claimed in claim 2, wherein the internal diameter D3 of the polyurethane layer at the edge of the coupler corresponds to the external diameter D2 of the cylindrical pipe end section or is at most 0.5% greater than this, and wherein the smallest internal diameter of the polyurethane layer is 0.35 to 1.5% smaller than the diameter D2 of the cylindrical pipe end section.
4. A coupler as claimed in claim 1 for connecting two shoulder-free pipes having the external diameter D6, wherein the inner layer has, approximately in the middle between the two coupler ends (a, b), a rib serving as a stop for the pipes to be connected to one another, wherein the inner surface of the coupler widens conically from this rib to one coupler end and is provided with at least one sealing bead running all around, while a cylindrical section, a rib projecting in a saw-tooth manner into the interior of the coupler and, adjacent to the radial flank of said rib, an annular groove are present between the other coupler end and the rib, the groove diameter n being larger than the internal diameter D4 of the cylindrical section and the latter essentially corresponding to the diameter D5 at the opposite coupler end (a).
5. A coupler as claimed in claim 4, wherein D6 ? D4 ? 1.005 D6 is applicable for the internal diameter D4 of the cylindrical section and D6 ? s ? D6 is applicable for the internal diameter s of the sawtooth rib.
6. A process for the production of a coupler provided with sealing means and intended for connecting two plastic pipes free of sealing means, wherein the coupler has an essentially cylindrical outer layer of glass fiber-reinforced plastic, and at least in the region of one edge, an inner layer consisting of integrally molded polyurethane and having an internal diameter decreasing toward the interior of the coupler, wherein, in a section between the two edges, the internal diameter of the coupler is at least as large as at the edge with the larger internal diameter and wherein a hollow cylinder of glass fiber-reinforced plastic is provided, by casting the mold, with an inner coating of polyurethane in such a manner that this coating gives the above-mentioned internal shape.
7. A mold for carrying out the process for the production of a coupler provided with sealing means and intended for connecting two plastic pipes which are free of sealing means and are each provided with a cylindrical end section having a diameter D2 which is smaller than the external diameter D1 of the remaining pipe section, wherein the coupler has an essentially cylindrical outer layer of glass fiber-reinforced plastic and, at least in the region of one edge, an inner layer consisting of integrally molded polyurethane and having an internal diameter decreasing toward the interior of the coupler, wherein, in a section between the two edges, the internal diameter of the coupler is at least as large as at the edge with the larger internal diameter, wherein the coupler is twice as long as the cylindrical end section, wherein the external diameter of the coupler essentially corresponds to the external diameter D1 of the remaining pipe section, wherein only one polyurethane layer beginning at one edge and extending only over up to 30 - 50% of the coupler length is present in the interior of the coupler, wherein a hollow cylinder of glass fiber-reinforced plastic is provided, by casting a mold, with an inner coating of polyurethane in such a manner that this coating gives the above-mentioned inner shape, wherein the mold consists of a baseplate and mold ring which can be, or is, connected to it, in order to impart the inner shape to the polyurethane inner layer to be produced by casting, and wherein the baseplate has positioning means in order to position the hollow cylinder of glass fiber-reinforced plastic coaxially with the mold ring.
8. A mold for carrying out the process for the production of a coupler provided with sealing means and intended for connecting two shoulder-free plastic pipes free of sealing means, wherein the coupler has an essentially cylindrical outer layer of glass fiber-reinforced plastic and, at least in the region of one edge, an inner layer consisting of integrally molded polyurethane and having an internal diameter decreasing toward the interior of the coupler, wherein, in a section between the two edges, the internal diameter of the coupler is at least as large as at the edge with the larger internal diameter, wherein the inner layer has, approximately in the middle between the two coupler ends, a rib which serves as a stop for the pipes to be connected to one another, wherein the inner surface of the coupler widens conically from this rib to one coupler end and is provided with at least one sealing bead running all around, while a cylindrical section, a rib projecting in a saw-tooth manner into the interior of the coupler and, adjacent to the radial flank of said rib, an annular groove are present between the other coupler end and the rib, the groove diameter n being larger than the internal diameter D4 of the cylindrical section and the latter essentially corresponding to the diameter D5 at the opposite coupler end, wherein a hollow cylinder of glass fiber-reinforced plastic is provided, by casting in a mold, with an inner coating of polyurethane in such a manner that this coating gives the above-mentioned internal shape, and wherein the mold has three individual parts, namely a first metallic part having a sleeve which serves for shaping the conical section and a lateral surface and the end surface of the rib and which is connected to an end plate extending radially outward and having a retaining ring which serves for holding the cylindrical, glass fiber-reinforced ring, a second cylindrical metal sleeve which serves for shaping the cylindrical section and the saw-tooth flank and can be pushed onto the first metal ring and a plastic ring which can be taken apart and serves for forming the annular groove.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH2622/91 | 1991-09-06 | ||
| CH262291 | 1991-09-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2077619A1 true CA2077619A1 (en) | 1993-03-07 |
Family
ID=4237903
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002077619A Abandoned CA2077619A1 (en) | 1991-09-06 | 1992-09-04 | Coupler for connecting two plastic pipes and process and mold for producing the coupler |
Country Status (13)
| Country | Link |
|---|---|
| US (1) | US5330238A (en) |
| EP (1) | EP0532459B1 (en) |
| JP (1) | JP3342714B2 (en) |
| KR (1) | KR100260343B1 (en) |
| AT (1) | ATE144602T1 (en) |
| AU (1) | AU651908B2 (en) |
| CA (1) | CA2077619A1 (en) |
| DE (1) | DE59207423D1 (en) |
| ES (1) | ES2093238T3 (en) |
| HK (1) | HK1007437A1 (en) |
| NO (1) | NO303084B1 (en) |
| RU (1) | RU2076987C1 (en) |
| SI (1) | SI9200178A (en) |
Families Citing this family (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0691506B1 (en) * | 1994-07-08 | 1998-09-23 | Hobas Engineering AG | Sleeve for connecting two plastic pipes |
| US5480196A (en) * | 1994-08-15 | 1996-01-02 | American Cast Iron Pipe Company | Ductile iron pipe joint employing a coupling and coupling therefor |
| WO1998056555A1 (en) * | 1997-06-09 | 1998-12-17 | Hobas Engineering Ag | Method for producing plastic pipes and pipe part produced according to said method |
| DE19902456A1 (en) | 1999-01-22 | 2000-08-10 | Boerge Carlstroem | Process for producing a glass fiber reinforced plastic tube and a coupling |
| DE19925817C1 (en) * | 1999-06-07 | 2000-08-31 | Hobas Engineering Gmbh Klagenf | Glass fiber reinforced plastic sleeve for pipe coupling has interior rubber-elastic sealing material bonded to sleeve by chemical cross-linking |
| DE10030231A1 (en) | 2000-06-20 | 2002-01-10 | Hobas Engineering Gmbh Klagenf | Coupling for connecting two pipes |
| EP1818590A1 (en) * | 2006-02-10 | 2007-08-15 | Luxembourg Patent Company S.A. | Sealed flange joint for high pressure and high purity gas channels |
| EP1909018B1 (en) * | 2006-10-05 | 2014-08-20 | Georg Fischer Rohrleitungssysteme AG | Pipe connection with thermal insulation and procedure for the manufacture of the pipe connecting part |
| US7942422B2 (en) * | 2009-01-02 | 2011-05-17 | Unisert Multiwall Systems, Inc. | Multiwall pipe lip seal joint |
| KR101082944B1 (en) | 2009-06-24 | 2011-11-11 | 천호산업(주) | The pump system for the transfer of the food waste |
| WO2011043689A1 (en) * | 2009-10-05 | 2011-04-14 | Zamaleev Firdaus Usmanovich | Coupler with inner seal prohibiting deposits, and variants |
| JP5643841B2 (en) * | 2010-01-04 | 2014-12-17 | ロクリング テクノロジー，エルエルシー | Mechanically mounted fitting for sour environment |
| KR101387422B1 (en) * | 2012-06-13 | 2014-04-21 | 듀라케미 (주) | The pipe form one body packing joint by protecting coating inside and outside of pipe |
| KR101379922B1 (en) | 2012-10-19 | 2014-04-02 | (주)에이티씨 | Pipe type fiber reinforced plastic composite structure and forming method for the same |
| PL2907643T3 (en) | 2014-02-13 | 2019-12-31 | Frimo Group Gmbh | Sealing device |
| KR102044171B1 (en) * | 2017-12-13 | 2019-11-13 | 주식회사 파라텍 | Applying apparatus of adhesive composition for a pipe and method for connecting pipes using the same |
Family Cites Families (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE80110C (en) * | ||||
| FR806525A (en) * | 1936-05-15 | 1936-12-18 | Anciens Etablissements Somborn | New pipe joint |
| US2302244A (en) * | 1942-01-27 | 1942-11-17 | John F Morrell | Pipe coupling and sealing device |
| US2794483A (en) * | 1955-11-28 | 1957-06-04 | John R Hopkins | Preformed product for protecting and coating field joints of pipes |
| FR1218062A (en) * | 1958-12-29 | 1960-05-09 | Yale & Towne Mfg Co | Advanced brake |
| US3575445A (en) * | 1965-06-24 | 1971-04-20 | Johns Manville | Thermally insulated pipe |
| FR1516933A (en) * | 1967-01-18 | 1968-02-05 | Fonderie Soc Gen De | Method for producing a seal for a pipe assembly |
| US3430989A (en) * | 1967-12-20 | 1969-03-04 | Pacific Clay Products | Pipe coupling |
| FR2204254A5 (en) * | 1972-10-25 | 1974-05-17 | Kleber Colombes | Elastic coupling of fibre-contg rubber - with axial elasticity and circumfer-ential rigidity |
| DE2343958A1 (en) * | 1973-08-31 | 1975-03-13 | Wolf Stahlbau Kg | Hop-picking machine with conveyor - incorporates chopper for bines directly after stripping machine and suction device for waste materials |
| CH600228A5 (en) * | 1976-10-13 | 1978-06-15 | Hobas Eng Ag | |
| US4229028A (en) * | 1978-12-20 | 1980-10-21 | Universal Sewer Pipe Company | Pipe coupler |
| SE8003870L (en) * | 1980-05-23 | 1981-11-24 | Forsheda Gummifabrik Ab | TETNINGSRING |
| US4400019A (en) * | 1981-04-22 | 1983-08-23 | Unisert Systems, Inc. | Multilayer pipe joint |
| DE3146272A1 (en) * | 1981-11-21 | 1983-06-01 | Metzeler Kautschuk GmbH, 8000 München | "DEVICE FOR ATTACHING A HOSE TO A CONNECTING PIECE" |
| US4565381A (en) * | 1984-04-24 | 1986-01-21 | Joelson C R | Self aligning concrete pipe with configured joint |
| US4915422A (en) * | 1989-01-06 | 1990-04-10 | The American Brass & Iron Foundry | Pipe coupling |
| US5186197A (en) * | 1992-07-06 | 1993-02-16 | Lavine Edward L | Collapsible umbrella handle |
-
1992
- 1992-08-18 EP EP92810628A patent/EP0532459B1/en not_active Expired - Lifetime
- 1992-08-18 AT AT92810628T patent/ATE144602T1/en not_active IP Right Cessation
- 1992-08-18 DE DE59207423T patent/DE59207423D1/en not_active Expired - Fee Related
- 1992-08-18 ES ES92810628T patent/ES2093238T3/en not_active Expired - Lifetime
- 1992-08-20 SI SI19929200178A patent/SI9200178A/en unknown
- 1992-08-31 JP JP23192692A patent/JP3342714B2/en not_active Expired - Fee Related
- 1992-09-01 AU AU22052/92A patent/AU651908B2/en not_active Ceased
- 1992-09-02 KR KR1019920015898A patent/KR100260343B1/en not_active IP Right Cessation
- 1992-09-04 NO NO923463A patent/NO303084B1/en not_active IP Right Cessation
- 1992-09-04 US US07/940,530 patent/US5330238A/en not_active Expired - Fee Related
- 1992-09-04 CA CA002077619A patent/CA2077619A1/en not_active Abandoned
- 1992-09-04 RU SU925052480A patent/RU2076987C1/en active
-
1998
- 1998-06-25 HK HK98106593A patent/HK1007437A1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| US5330238A (en) | 1994-07-19 |
| DE59207423D1 (en) | 1996-11-28 |
| NO303084B1 (en) | 1998-05-25 |
| ES2093238T3 (en) | 1996-12-16 |
| RU2076987C1 (en) | 1997-04-10 |
| HK1007437A1 (en) | 1999-04-09 |
| EP0532459B1 (en) | 1996-10-23 |
| JPH05209698A (en) | 1993-08-20 |
| AU2205292A (en) | 1993-03-11 |
| KR930006358A (en) | 1993-04-21 |
| JP3342714B2 (en) | 2002-11-11 |
| EP0532459A1 (en) | 1993-03-17 |
| ATE144602T1 (en) | 1996-11-15 |
| SI9200178A (en) | 1993-03-31 |
| NO923463D0 (en) | 1992-09-04 |
| NO923463L (en) | 1993-03-08 |
| AU651908B2 (en) | 1994-08-04 |
| KR100260343B1 (en) | 2000-07-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |